Log drum

From AudioLexic

A log drum is a type of unpitched percussion instrument that creates its resonance with two tongues that are carved into a hollow box. This box is usually made out of cherry or maple wood. The two tongues are carved in a manner such that one is higher pitched than the other one. When a tongue is struck, it vibrates, resonating through the box-like chamber and creating a dark mellow tone. The instrument is to be played with soft rubber or yarn mallets.